Magnetically-operated device.



61%? R, GANFEELD.

H. TRATTON MAGNEHMLLY OPERATED DEVICE.

APPLICATION man APR,18, i913.

INVENTORS wnuzssss UNITED str 'r s PATENT OFFICE.

HARRY F. STRATTON AND HARRY ILCANFIELD, F CLEVELAND, OHIO, ASSIG-NORS TO THE ELECTRIC CONTROLLER AND MANUFACTURING COMPANY, OF CLEVELAND,

OHIO, A CORPORATION OF OHIO.

MAGNETIGALLY-OPERATED DEVICE.

To all whom it may concern Be it known that we, HARRY F. STRATTON and HARRY R. CANFIELD, citizens of the 'United'States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented new and useful Improvements in Magnetically-Operated Devices, of which the following is a specification.

Our invention relates to a novel method of constructing electro-magnets, particularly those excited by alternating currents.

The objects of our invention are to provide effective means for binding the lam1na tions of the armature and core together, to

rovide means for securing a low reluctance 1n the magnetic circuit, to provide for prolonging the life of the engaging surfaces of the core and armature, and to provide means for reducing chattering to a minimum.

Other objects and advantages will appear in the following description.

In carrying out our invention wehold the laminated portions of the armature and core firmly and permanently together by welding them together or by welding plates across the edges of the laminations. These plates may also form the engaging surfaces between the armature and the magnet, thus reventing injury to the laminations.

ddy currents are set up in these plates which produce a magnetic flux out of phase with the flux produced by the energizing winding, whereby a pull is exerted between the armature and magnet during the reversal of the alternating flux, which increases the holding power of the'magnet and prevents the armature from chattering.

Referring to the accompanying drawings, Figure 1 is a front elevation of the magnet; Fig. 2 is a side elevation, parts being in section; Fig. 3 is a cross section of the armature and its support, taken through the pin 17 and the bolts 19; and Fig. 4 1s a section on the line IV-IV, Fig. 1.

Onthe base 1, composed preferably of slate or other insulating material, we mount the U-shaped core 2, composed of vertical laminations, preferably composed of soft steel. The laminations may be spot-welded together directly by the electric or other process, but we prefer to weld the edges of the laminations to metal plates or strips. For example, we weld the strips 3 to the rear ed gas of the laminations, and the strips Specification of Letters Patent.

Application filed April 18, 1913.. Serial No. 761,976.

Patent ed May 9, 1916.

9 to the front edges of the two legs or poles of the core 2, the outer angles f the legs being recessed to receive th strips 9, so that the front faces of the strips 9 shall be nearly flush with the frontends of the said poles. The bolts 4 pass-through the strips 3 and base 1 and secure the core to the base.

- The two poles of the core are in vertical alinement and the magnetizing winding 5 is shown around the upper pole. The armature 6 is also made up of vertical laminations composed preferably of steel, embraced on their outer edges and their sides by U-shaped holder 7, which is welded to the laminations on its inner surface 8 or along its edges 8. Strips 10 are seated in recesses in the inner Icorners of the armature, the strips 10 lying opposite the strips 9 and parallel therewith. The stripslO are welded to the edges of the laminations of the armature 6. The opposing strips 9 and 10 preferably form engaging surfaces when the armature is drawn toward the poles of the core 2.

The strips or plates 9 and 10 are preferably composed of steel, and have the fourfold function of holding the laminations .together, reducing the reluctance of the magnetic clrcuit, producing a flux out of phase with that produced by the winding 5, whereby the armature is held firmly without chattering, and providing durable wearing surfaces, thereby protecting the engaging surfaces and preventing injury to the laminations caused by the impact of the armature. Any number of strips or plates 9 and 10 may be used. If they are of nonmagnetic material, their function of reducing the reluctance in the magnetic circuit is not present.

The armature 6 is supported by the lever 11 mounted on the shaft 12, which is carried by the bearings 13 bolted to the base 1. The lever 11. has the arm 1 1 which engages the stop 15 to limit the opening movement of the armature 6. The lever 11 may be secured to the shaft 12 by the set screw 16 or other suitable means, so that the shaft 12 can move any device suitably attached thereto. The arm 14: engages the underside of the stop 15 when the Winding is not energized, but when the winding is sufficiently energized, the armature 6 will be attracted to the poles of the magnet, the lever 11 will 'cillation of the holder be swung to the position shown on Fig. 2, and the plates 9 and 10 will come into mutual engagement.

In order that the armature may have a free movement so that the surfaces of the opposing plates 9 and 10 may fully engage each other, the armature is connected to the lever 11 in the manner now to be described. The holder 7 has a forward In 7 located between a pair of lugs 11 on t e lever 11. A pin 17, secured to one of the lugs 11' by the cross-pin 18, extends through an opening in the lug 7, the pin 17 being rounded or barrel-shaped in the lug 7 and the lug 7 fitting loosely between the lugs 11, so that the holder 7 can swing not only vertically but also slightly laterally. The lever 11 carries in its sides which overlap the sides of the holder 7, the bearing bolts or screws 19, which form ivots for the osabout an axis through these bolts, this oscillation being permitted by making the slot in. the lug 7 for the pin 17 oblong in a vertical direction as shown by the dotted lines 20'. The sides of the holder 7 are slotted horizontally as shown at 21 so that the holder may receive the bolts 19 and have slight vertical oscillation, if necessary, in order to permit the plates 9 and 10 to fully engage each other. By mounting the holder 7 as described or in an equivalent manner, the holder can turn in any direction so as to bring the opposing surfaces of the plates into intimate contact.

We claim.

1. In an electromagneticdevice, a pole comprising the edges of a laminated core, a winding for energizing the core, an arma ture arranged to be attracted toward the said pole when the winding is suitably energized, and metallic strips arranged transversely of the laminations and secured thereto, the strips, being embedded in the corners of the laminations and lying substalntially flush with the face of the said po e.

2. In an electromagnetic device, a laminated core having a plurality of pole faces, a laminated armature having corresponding and co-acting pole faces, an energizi winding adapted to energize said core ahfi armature with alternating magnetism for attractingsaid armature toward said core, a plate of magnetic material welded upon each of the said pole faces of said core and armature and covering only a portion thereof to set up a two-phase flux in said poles and to prevent the laminations of the armature from coming into contact with the laminations of the core.

3. In an electromagnetic device, a core built up vof laminations held together by welds and having a plurality of pole faces, an armature built up of laminations held together by welds and having corresponding and co-acting pole faces, an energizin winding adapted to energize said core an magnet with alternating magnetism for attracting said armature toward said core, said welds comprising a plate ofmagnetic material on each of said pole faces and covering only a portion thereof to set up a two-- phase flux in said poles and to prevent the" laminations of the armature from coming into contact with the laminations of the core.

Signed at Cleveland, Ohio, this 16th day of April, A. D. 1913.

HARRY F. STRATTON. HARRY R. CANFIELD.

v Witnesses: 

